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Corrosion behavior of Mg, AZ31, and AZ91 alloys in dilute NaCl solutions

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Abstract

Corrosion behavior of extruded Mg, extruded AZ31 alloy, and cast AZ91 alloy was investigated by electrochemical measurements in dilute NaCl solutions. Corrosion products and passivation films were analyzed by X-ray diffraction and X-ray photoelectron spectroscopy. All specimens exhibit the corrosion and passivation zones in dilute NaCl solutions. The aluminum content and alloy microstructure influence the corrosion and passivation processes. AZ91 alloy shows the broadest passivation zone followed by AZ31 alloy and Mg. AZ91 alloy reveals a highest corrosion resistance, and preferential attack is located at the primary Mg phase. Its relatively fine β-phase (Mg17Al12) network and Al2O3/Al(OH)3 compounds produced on the passivation film are the main factors which limit the corrosion progress as compared with AZ31 alloy and Mg. The thick passivation product on AZ31 alloy is the key factor which restricts the corrosion attack in dilute solutions.

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Acknowledgments

The authors wish to thank Dr. Hideo Iwai for his technical assistance in the experiment.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Lei Wang & Bo-Ping Zhang

  2. Materials Reliability Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan

    Lei Wang & Tadashi Shinohara

Authors
  1. Lei Wang
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  2. Tadashi Shinohara
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  3. Bo-Ping Zhang
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Correspondence to Tadashi Shinohara.

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Wang, L., Shinohara, T. & Zhang, BP. Corrosion behavior of Mg, AZ31, and AZ91 alloys in dilute NaCl solutions. J Solid State Electrochem 14, 1897–1907 (2010). https://doi.org/10.1007/s10008-010-1020-1

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  • DOI: https://doi.org/10.1007/s10008-010-1020-1

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